Vec3d.fromNative constructor
      
      Vec3d.fromNative(
    
    
- Vec3d v
Implementation
factory Vec3d.fromNative(cvg.Vec3d v) {
  final p = calloc<cvg.Vec3d>()
    ..ref.val1 = v.val1
    ..ref.val2 = v.val2
    ..ref.val3 = v.val3;
  return Vec3d._(p);
}